The ISL28276 and ISL28476 are Dual and Quad channel micropower precision operational amplifiers optimized for single supply operation at 5V and can operate down to 2.4V. They feature an Input Range Enhancement Circuit (IREC) which enables both parts to maintain CMRR performance for input voltages equal to the positive and negative supply rails. The input signal is capable of swinging 0.5V above a 5.0V supply (0.25V for a 2.4V supply) and to within 10mV from ground. The output operation is rail to rail. The both parts draw minimal supply current while meeting excellent DC-accuracy, AC-performance, noise and output drive specifications. Offset current, voltage and current noise, slew rate, and gain-bandwidth product are all two to ten times better than other micropower op-amps with equivalent supply current ratings. The ISL28276 and ISL28476 can be operated from one lithium cell or two Ni-Cd batteries. The input range includes both positive and negative rail.
The ISL28276 and ISL28476 are dual‑ and quad‑channel micropower precision operational amplifiers optimized for single‑supply operation from 2.4 V to 5.5 V. They feature rail‑to‑rail input and output, an Input Range Enhancement Circuit for full‑rail CMRR, and a low supply current of 60 µA per channel while delivering 31 mA output drive.
Typical applications include battery‑ or solar‑powered systems, handheld consumer products, medical devices, thermocouple amplifiers, photodiode pre‑amps, and pH‑probe amplifiers. The devices are offered in a 16‑lead QSOP package with optional Pb‑free, RoHS‑compliant versions.
| Supply current per channel | 60 µA |
|---|---|
| Maximum offset voltage | 100 µV |
| Input bias current | 500 pA |
| Power‑supply rejection ratio (PSRR) | 115 dB |
| Common‑mode rejection ratio (CMRR) | 115 dB |
| Supply voltage range | 2.4 V to 5.5 V |
| Output drive current | 31 mA |
| Rail‑to‑rail output swing | within 3 mV of supply rails |
The devices operate from a single supply as low as 2.4 V.
Each channel draws about 60 µA when enabled.